Type-writing machine.



P. L. MORGAN.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 20, 1908.

918,459. Patented Apr. 13,1909.

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' platen,

UNITED STATES PATENT OFFICE.

FRANK L. MORGAN, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO UNDERWOOD TYPEWBITER -OO1\IPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE Specification of Letters Patent.

Patented April 13., 19Q9.

To all achom it may concern:

citizen of the United States, residing in the city of Vashington, District of Columbia,

have invented certain new and useful Improvements in Type-lvriting Machmes, of

which the following is a specification. V

"This invention relates to the rotatable platens of typewriting machines.

The platen is usually mounted in a platen oftendesirableto substitute a platen having a soft and yielding printing surface for one having a hard surface, and in order to do this .it. is usually necessary to remove the platen axle with 'its'appu'rtenances from the The principal object of thisinvention is to avoid the necessity ofremoving the platen axle when changing the platen, and to provide a simple and nexpensive construction.

whereby the platen can be readily removed from and replaced in the machine.- To this end I provide a platen havingadiametrical groove or slot in each end, and I rotatably nioii'nt in each'of the platen-frame ends a head. which is complementid to the platen end; said head provided witha key in the form of aldiametrical feather or rib to en-- gage the slot in the platen ends, to couple thc'heads and cylinder; and means arealso is" a-front elevation, partlyin section, of the isa perspective view provided to lock the heads to the cylinder.

In the accompanying drawings, Figure 1 platen frame of, an Underwood front strike wrrting machine with my improved platen m0u nted therein; Fig. 2 is an end elevation of'the platen and platenhead, and Fig. 3 I I showing the manner of;

removing the platen.

' i The invention is illustrated in connection with-theplaten-frame of the standard Underwood typewriting machine, which comprises ends 1, 2, and a rear paper shelf 3 extending between and secured tosaid ends, said shelf also curving forwardly beneath and up around the front. of the platen, as at 4.

Permanently -mountedto rotate in the platen frameends' are opposite separate spindles 8, 9, provided at their outer ends with knobs 10, The usual line space Wheel -11 is mounted u on the spindle 8. Secured to the inner en s of the spindles are heads 12,13. These are coinplemental to the ends or end-pieces of a cylindrical platen 14. The heads are provided with feathers or keys, in the form of ribs 15 extending dia-. metrically, to fit corresponding key-ways or slots 16 in the platen ends, to couple the heads to the platen. The heads 12, '13 are also provided with detents 17, 18 to engage sockets or recesses 19 in the platen ends, to lock the heads to the platento enable the heads to rotate or control the platen, and 'to prevent displacement of the platen tran versely'of its axis. Said detents are provided with finger-pieces 21, 22 to throw them into and out of locking positions.

When it is desired to remove the platen, it is rotated until the keys 15 are in substantially vertical positions, -or until the finger-pieces 21, 22are in their uppermost positions, The detents are thenthrown out of engagement with the platen by means of the finger-pieces, and the platen lifted upwardly from the machine, as at Fig. 3.

To replace the platen in the platen frame,

the keys 15 on the heads 12, 13 are caused to register with the slots or slideavays 16 in the ends of the platen, and the platen slid.

down along said keys untilit rests upon abutments or seats23 provided upon theheads, and the detents 17,18 forced-into the sockets 19 in the ends of the platen, when the platen is in readiness for Writing;

Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a platen frame, of a air' of platenrotating heads rotatably anol permanently inountedfherein, and a platen releasably'eir gaged by said heads.

' 2. In a type Writing machine, the combination with a platen frame, of a pair of se arate heads rotatably mounted therein, an a cylindrical platen said heads provided with means to couple them to" the platen and to lock the platen against transverse displace. ment. I 3. In a typewritin machine,'the combina- 'tion witha platen frame, of a cylindrical platen provided with a slot; or keywayfin each end, an mounted in, he p aten frame; feachhead provided with a key in the form of a rib extending diametrically thereof to enga the keyway in the end of the platen to coupT the head to the platen. .4 In ,a'typewriting machine, the combina a, air of heads rotatably tion with a platen frame having a pair of gal therewith, and detents carried by the heads 1 ends, of separate spindles journaled in said ends, heads secured to said spindles, a platen rele'asably engaged by said heads to rotate to engage and lock the cylinder against radial displacement.

5. In a typewriting machine, the combination with a platen frame having a pair of end of separate spindles journaled in said ends, heads secured to said spindles, a platen releasably engaged by said heads to rotate therewith, and detents carried by the heads to couple the heads and cylinder and to lock the latter against radial displacement; said detents provided with finger pieces to throw them into and out of engagement with the cylinder.

6. In a typewriting machine, the combination with a platen frame "having a pair of ends, of a cylindrical platen provided with a pair of end-pieces, a pair of heads complemental to the platen end-pieces and rotatably mounted in the platen frame ends, releasable means to couple said heads to the platen, and means to rotate the heads and platen.

7. A removable platen for a typewriter comprising a cylindrical body portion having a pair of end-pieces, each provided with a slot or keyway extending diametrically thereof.

8. Ip a typewrit-ing machine, the combination With a platen frame having a pair of ends, of heads, spindles on which said heads i i s eiaaaa ends, of a removable cylinder having a keyway in each end in the form of a recess extending diametrically thereof, a pair of heads complemental to the cylinder ends and mounted to rotate the platen frame ends,

and provided with keys to fit the keyways in the cylinder ends to couple the heads and cylinder together, adetent carried by each head to engage the cylinder and lock it against transverse movement, and ifingerpieces connected to the dete'nts.

10. In a typewriting machine provided with a platen frame having a pair of ends, the combination of a spindle 3ournaled in each end, a head having a key in the'form of a radial rib secured-t0 each spindle, means to rotate said spindles, a cylinder haying I key seats or recesses in its ends to be engaged by the keys on theheads, detents carried by the heads to engage the cylinder to lock the heads to the cylinder, and fingerpieces .to throw the detents into and-nut of engagement with the platen.

FRANK L. MORGAN.

Witnesses:

M. L. Jones, F. B. HAWKINS. 

